Caesar 4.30
After perceiving these circumstances, the chiefs of the British tribes, who had assembled near
Caesar after the battle, conversed among themselves, and when they became aware that
cavalry and ships and grain were in short supply to the Romans, and discovered the small
number of soldiers from the meagreness of the camps (which were also narrower because of
this, since Caesar had took his legions across without equipment), they thought that the best
plan was to renew the war, and keep our soldiers away from grain and provisions and prolong
the plan until the winter, because, with these soldiers having been overcome or prevented
from returning, they were confident that no one would be able to cross over afterwards to
Britain for the sake of waging war. And so, with the conspiracy undertaken again, they began to
depart little by little from the camps and bring their people secretly from the fields.